Characteristics

Model structureThe data was determined by flow simulation and based on the VDI/VDE 2173 with a permissible deviation of +/- 10% (medium = water 20°C, pressure loss delta p = 1 bar).

Definition KvsThe KVS value designates the maximum possible throughput for a valve with a 100% opening

Definition KvThe flow coefficient Kv [m3/h] is a specific volume flow for the following conditions:– The pressure loss (?p) via the valve is 105 Pa (1 bar)– The medium is water with a temperature between 278 K and 315 K (5°C to 40°C)

Definition CvThe flow coefficient Cv is a valve flow coefficient that does not correspond to S.I. units. It represents the number of U.S. gallons of water which flow through a valve with a pressure loss of 1 psi (0.689 mbar) at a temperature of 40°F to 100°F (4°C to 38°C) within a minute. Cv = Kv/0,865